Php $ _ SERVER ['orig _ script_name ']

The main points are as follows: 1. there is no documentation for the framework; 2. there is no comment in the source code of the framework; 3. few people in our department are familiar with the use of this framework except for the main line developers; if you want to use this framework to do things, there is only one way: look at the source code, first understand the implementation principle of the framework, and then use this bird to do things. When I see a request processing class, the following code comes into view: staticfunctionget_base_url () {mainly has the following points:

1. this framework has no documentation;

2. there is no comment in the framework source code;

3. in addition to the main line developers, few of our departments are familiar with this feature;

If you want to use this framework to do things, there is only one way: look at the source code, first understand the implementation principle of the framework, and then use this bird to do things.

When I saw a request processing class, the following code came into view:

 static function get_base_url(){         $filename = (isset($_SERVER['SCRIPT_FILENAME'])) ? basename($_SERVER['SCRIPT_FILENAME']) : '';          if (isset($_SERVER['ORIG_SCRIPT_NAME']) && basename($_SERVER['ORIG_SCRIPT_NAME']) === $filename) {             $base_url = $_SERVER['ORIG_SCRIPT_NAME'];           } elseif (isset($_SERVER['SCRIPT_NAME']) && basename($_SERVER['SCRIPT_NAME']) === $filename) {              $base_url = $_SERVER['SCRIPT_NAME'];          } elseif (isset($_SERVER['PHP_SELF']) && basename($_SERVER['PHP_SELF']) === $filename) {             $base_url = $_SERVER['PHP_SELF'];          } else {             $path    = isset($_SERVER['PHP_SELF']) ? $_SERVER['PHP_SELF'] : '';             $file    = isset($_SERVER['SCRIPT_FILENAME']) ? $_SERVER['SCRIPT_FILENAME'] : '';             $segs    = explode('/', trim($file, '/'));             $segs    = array_reverse($segs);             $index   = 0;            $last    = count($segs);            $base_url = '';             do {                 $seg = $segs[$index];                 $base_url = '/' . $seg . $base_url;                 ++$index;             } while (($last > $index) && (false !== ($pos = strpos($path, $base_url))) && (0 != $pos));         }                  $request_uri = self::get_request_uri();         if (0 === strpos($request_uri, $base_url)) {             return self::dirname($base_url);         }        if (0 === strpos($request_uri, dirname($base_url))) {             return self::dirname($base_url);         }                 $truncatedrequest_uri = $request_uri;        if (($pos = strpos($request_uri, '?')) !== false) {             $truncatedrequest_uri = substr($request_uri, 0, $pos);         }                 $basename = basename($base_url);         if (empty($basename) || !strpos($truncatedrequest_uri, $basename)) {             return;        }                 if ((strlen($request_uri) >= strlen($base_url))         && ((false !== ($pos = strpos($request_uri, $base_url))) && ($pos !== 0)))  {            $base_url = substr($request_uri, 0, $pos + strlen($base_url));         }                    return  rtrim(self::dirname($base_url), '/');     }

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